Above the magnet train station, you will see a small house.I t is the golden rod tunnel!!!
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just go via the other tunnel then you can get there.
The Goldenrod City tunnel in Pokemon HeartGold is in the place where you got your Team Rocket uniform from.go in all of the houses in goldenrod and then you will find it (it looks like a very small house
goldenrod's tunnel but you need to pay
talk to a man in goldenrod tunnel, he will ask to take a picture. if you mean during the story, talk to a team rocket member in goldenrod tunnel, he will let you wear it.
in front of bill's moms house and beside the purpule tent at the top of the city(goldenrod)